Self-dumping screening and washing machine



w. F. MARTIN. SELF DUMPING, SCREENING AND WASHING-MA CHINE.

APPLICATION FILED MAY 18.71922. I

Patented Dec. 5, 1922.

Patented cc, 5, 1922.

WILLIAM F. MARTIN, OF WORIVILEYSBURG, PENNSYLVANIA.

SELF-DUMPING SCREENING AND WASHING MACHINE.

Application filed May 18,

To all whom it may concern:

Be it known that 1, WILLIAM F. ltLinrIN, a citizen of the United States, residing at WVormleysburg, in the county of Dauphin and State of Pennsylvania, have invented certain new and useful Improvements in Self-Dumping Screening and Washing Machines; and I do declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

My invention has reference to machines for screening coal, ore and other materials and relates more particularly to screening machines of the type having a plurality of pockets beneath the screen for receiving the waste products. Such a machine is shown in my U. S. Patent No. 1412291, issued .i-ipril 11, 1922, but whereas the pockets of this patented machine are dumped by hand, it is the object of the present improvement to provide a weighted arm having suitable connections with the movable parts of the pockets, so that while the latter are normally held closed, they may open against the action of the weight when sufficient waste material accumulates.

With the foregoing in view, the invention resides in the novel subject matter hereinafter described and claimed, the description being supplemented by the accompanying drawings.

Figure 1 is a side elevation with parts broken away'and in section, showing the improved machine.

Figure 2 is a partial top plan view.

In the drawin s above briefly described, the numeral 1 designates a suitable frame which is suitably supported in an inclined position, said frame having in its upper portion a screen 2 while a plurality of pockets 3 of any desired shape are formed beneath said screen for the purpose of collecting the waste material falling through the latter. Each pocket 3 is provided with a movable wall 4 which is preferably pivoted as indicated at 5, the movable walls of the several pockets being connected to a longitudinal connecting rod 6 which is linked at 7 1922. Serial No. 561,980.

to a depending crank arm 8 on a control shaft 9 which extends across the upper end of the frame 1. One end of the shaft 9 is provided with a-rigid crank arm 10 and a suitable weight 11 is adjustable along this arm by means of a set screw or other preferred means 12.

By employing the construction shown, the pockets 3 will normally be held closed by the action of the weight 11, but as soon as sufficient material accumulates in said pockets to overcome the action of said weight, the walls a will move outwardly under the action of said material and consequently the pockets will be self-dumping.

Since excellent results may be obtained from the details disclosed, they may well be followed, but within the scope of the invention as claimed, numerous minor changes may be made.

I claim '2 1. A screening machine comprising a frame, a screen therein, a plurality of collecting pockets beneath said screen and each having a dumping section, means for imparting movement to said dumping section and normallly retaining the dumping sections in a closed position, said means including a rock shaft, a rigid arm extending from said rock shaft, and a weight on said rigid arm, said weight yieldably holding the rock shaft against rotation in one direction with the dumping sections in a closed position.

2. A screening machine comprising a frame, a screen therein, a plurality of. colweight on said last named arm, said weight and the connections between it. and said dumping sections, serving to normally hold the latter in closed position.

In testimony whereof I have hereunto set my hand.

WILLIAM F. MARTIN. 

